Abstract
Dielectric measurements on tetramethyl-bisphenol-A polycarbonate (TMPC), polystyrene (PS), and 50 wt% TMPC/PS blend were made in the frequency range of 0.1 mHz to 1 MHz at various temperatures. The α-relaxation process due to main-chain motions was observed for each polymer and the β-relaxation processes due to local motions of TMPC were observed for TMPC and TMPC/PS blend. Plots of logarithm of the relaxation time for the β process against the reciprocal of the absolute temperature were fit to Arrhenius functions for TMPC and the blend. However the relaxation strength and the shape parameter of the Cole–Cole equation had changes around the glass transition temperature, T g. These changes in relaxation parameters around T g was observed for the first time for the β process. Based on these results we suggest that even the local chain motions are affected by the glass transition phenomena, although the β process are not described by the Vogel–Fulcher–Tamman equation.
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